Strategic Patrol Update – the recently refitted Strategic Submarine VIGILANT will complete post refit sea trials in June (2012) and will then pass to FOST (Flag Office Sea Training) and then rejoin the Strategic Patrol cycle with the previously refitted VANGUARD and VICTORIOUS.     The VENGEANCE now under refit at Devonport will complete refit and start sea trials in 2015 and complete the half life refuelling and refitting of the entire class.